test/rdoc/test_rdoc_info_formatting.rb uses /tmp/rdoc-$$.
In usual, it is removed by teardown.

But if ruby dumps core before teardown, it is not removed.
This is happen now.
http://www.rubyist.net/~akr/chkbuild/debian/ruby-trunk/log/20080719T111700.txt.gz

I hope tests use Dir.tmpdir in tmpdir.rb which respects
TMPDIR environment variable.

chkbuild sets different TMPDIR for each build.
So chkbuild can remove temporally files even if ruby dumps
core.

Now I must remove /tmp/rdoc-* manually.
This is frustrating.

I think rdoc test is the only test which uses hardcoded /tmp
in test-all.
(RubySpec uses /tmp, though)
-- 
Tanaka Akira